A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN 5990-01-605-4769
NSN 4140-00-423-6663
NSN 6645-00-336-4783
NSN 5910-00-457-7947
NSN 5855-01-165-2177
NSN 5910-01-451-4905
NSN 5930-01-422-1702
NSN 6620-01-406-6840
NSN 5945-01-073-5791
NSN 6150-00-813-9422
NSN 6240-00-533-1493
NSN 6220-00-429-0950